drivers/net/wireless/ti/wlcore/ps.c

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2008-2009 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include "ps.h"
  25 #include "io.h"
  26 #include "tx.h"
  27 #include "debug.h"
  28
  29 #define WL1271_WAKEUP_TIMEOUT 500
  30
  31 #define ELP_ENTRY_DELAY  30
  32 #define ELP_ENTRY_DELAY_FORCE_PS  5
  33
  34 void wl1271_elp_work(struct work_struct *work)
  35 {
  36         struct delayed_work *dwork;
  37         struct wl1271 *wl;
  38         struct wl12xx_vif *wlvif;
  39         int ret;
  40
  41         dwork = container_of(work, struct delayed_work, work);
  42         wl = container_of(dwork, struct wl1271, elp_work);
  43
  44         wl1271_debug(DEBUG_PSM, "elp work");
  45
  46         mutex_lock(&wl->mutex);
  47
  48         if (unlikely(wl->state != WLCORE_STATE_ON))
  49                 goto out;
  50
  51         /* our work might have been already cancelled */
  52         if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
  53                 goto out;
  54
  55         if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
  56                 goto out;
  57
  58         wl12xx_for_each_wlvif(wl, wlvif) {
  59                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
  60                         goto out;
  61
  62                 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) &&
  63                     test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
  64                         goto out;
  65         }
  66
  67         wl1271_debug(DEBUG_PSM, "chip to elp");
  68         ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_SLEEP);
  69         if (ret < 0) {
  70                 wl12xx_queue_recovery_work(wl);
  71                 goto out;
  72         }
  73
  74         set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
  75
  76 out:
  77         mutex_unlock(&wl->mutex);
  78 }
  79
  80 /* Routines to toggle sleep mode while in ELP */
  81 void wl1271_ps_elp_sleep(struct wl1271 *wl)
  82 {
  83         struct wl12xx_vif *wlvif;
  84         u32 timeout;
  85
  86         /* We do not enter elp sleep in PLT mode */
  87         if (wl->plt)
  88                 return;
  89
  90         if (wl->sleep_auth != WL1271_PSM_ELP)
  91                 return;
  92
  93         /* we shouldn't get consecutive sleep requests */
  94         if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
  95                 return;
  96
  97         wl12xx_for_each_wlvif(wl, wlvif) {
  98                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
  99                         return;
 100
 101                 if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) &&
 102                     test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
 103                         return;
 104         }
 105
 106         timeout = wl->conf.conn.forced_ps ?
 107                         ELP_ENTRY_DELAY_FORCE_PS : ELP_ENTRY_DELAY;
 108         ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
 109                                      msecs_to_jiffies(timeout));
 110 }
 111
 112 int wl1271_ps_elp_wakeup(struct wl1271 *wl)
 113 {
 114         DECLARE_COMPLETION_ONSTACK(compl);
 115         unsigned long flags;
 116         int ret;
 117         unsigned long start_time = jiffies;
 118         bool pending = false;
 119
 120         /*
 121          * we might try to wake up even if we didn't go to sleep
 122          * before (e.g. on boot)
 123          */
 124         if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))
 125                 return 0;
 126
 127         /* don't cancel_sync as it might contend for a mutex and deadlock */
 128         cancel_delayed_work(&wl->elp_work);
 129
 130         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
 131                 return 0;
 132
 133         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
 134
 135         /*
 136          * The spinlock is required here to synchronize both the work and
 137          * the completion variable in one entity.
 138          */
 139         spin_lock_irqsave(&wl->wl_lock, flags);
 140         if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
 141                 pending = true;
 142         else
 143                 wl->elp_compl = &compl;
 144         spin_unlock_irqrestore(&wl->wl_lock, flags);
 145
 146         ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP);
 147         if (ret < 0) {
 148                 wl12xx_queue_recovery_work(wl);
 149                 goto err;
 150         }
 151
 152         if (!pending) {
 153                 ret = wait_for_completion_timeout(
 154                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
 155                 if (ret == 0) {
 156                         wl1271_error("ELP wakeup timeout!");
 157                         wl12xx_queue_recovery_work(wl);
 158                         ret = -ETIMEDOUT;
 159                         goto err;
 160                 }
 161         }
 162
 163         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 164
 165         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 166                      jiffies_to_msecs(jiffies - start_time));
 167         goto out;
 168
 169 err:
 170         spin_lock_irqsave(&wl->wl_lock, flags);
 171         wl->elp_compl = NULL;
 172         spin_unlock_irqrestore(&wl->wl_lock, flags);
 173         return ret;
 174
 175 out:
 176         return 0;
 177 }
 178
 179 int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 180                        enum wl1271_cmd_ps_mode mode)
 181 {
 182         int ret;
 183         u16 timeout = wl->conf.conn.dynamic_ps_timeout;
 184
 185         switch (mode) {
 186         case STATION_AUTO_PS_MODE:
 187         case STATION_POWER_SAVE_MODE:
 188                 wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)",
 189                              mode, timeout);
 190
 191                 ret = wl1271_acx_wake_up_conditions(wl, wlvif,
 192                                             wl->conf.conn.wake_up_event,
 193                                             wl->conf.conn.listen_interval);
 194                 if (ret < 0) {
 195                         wl1271_error("couldn't set wake up conditions");
 196                         return ret;
 197                 }
 198
 199                 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout);
 200                 if (ret < 0)
 201                         return ret;
 202
 203                 set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
 204
 205                 /*
 206                  * enable beacon early termination.
 207                  * Not relevant for 5GHz and for high rates.
 208                  */
 209                 if ((wlvif->band == IEEE80211_BAND_2GHZ) &&
 210                     (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
 211                         ret = wl1271_acx_bet_enable(wl, wlvif, true);
 212                         if (ret < 0)
 213                                 return ret;
 214                 }
 215                 break;
 216         case STATION_ACTIVE_MODE:
 217                 wl1271_debug(DEBUG_PSM, "leaving psm");
 218
 219                 /* disable beacon early termination */
 220                 if ((wlvif->band == IEEE80211_BAND_2GHZ) &&
 221                     (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
 222                         ret = wl1271_acx_bet_enable(wl, wlvif, false);
 223                         if (ret < 0)
 224                                 return ret;
 225                 }
 226
 227                 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0);
 228                 if (ret < 0)
 229                         return ret;
 230
 231                 clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
 232                 break;
 233         default:
 234                 wl1271_warning("trying to set ps to unsupported mode %d", mode);
 235                 ret = -EINVAL;
 236         }
 237
 238         return ret;
 239 }
 240
 241 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
 242 {
 243         int i;
 244         struct sk_buff *skb;
 245         struct ieee80211_tx_info *info;
 246         unsigned long flags;
 247         int filtered[NUM_TX_QUEUES];
 248         struct wl1271_link *lnk = &wl->links[hlid];
 249
 250         /* filter all frames currently in the low level queues for this hlid */
 251         for (i = 0; i < NUM_TX_QUEUES; i++) {
 252                 filtered[i] = 0;
 253                 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
 254                         filtered[i]++;
 255
 256                         if (WARN_ON(wl12xx_is_dummy_packet(wl, skb)))
 257                                 continue;
 258
 259                         info = IEEE80211_SKB_CB(skb);
 260                         info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 261                         info->status.rates[0].idx = -1;
 262                         ieee80211_tx_status_ni(wl->hw, skb);
 263                 }
 264         }
 265
 266         spin_lock_irqsave(&wl->wl_lock, flags);
 267         for (i = 0; i < NUM_TX_QUEUES; i++) {
 268                 wl->tx_queue_count[i] -= filtered[i];
 269                 if (lnk->wlvif)
 270                         lnk->wlvif->tx_queue_count[i] -= filtered[i];
 271         }
 272         spin_unlock_irqrestore(&wl->wl_lock, flags);
 273
 274         wl1271_handle_tx_low_watermark(wl);
 275 }
 276
 277 void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 278                           u8 hlid, bool clean_queues)
 279 {
 280         struct ieee80211_sta *sta;
 281         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 282
 283         if (WARN_ON_ONCE(wlvif->bss_type != BSS_TYPE_AP_BSS))
 284                 return;
 285
 286         if (!test_bit(hlid, wlvif->ap.sta_hlid_map) ||
 287             test_bit(hlid, &wl->ap_ps_map))
 288                 return;
 289
 290         wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d "
 291                      "clean_queues %d", hlid, wl->links[hlid].allocated_pkts,
 292                      clean_queues);
 293
 294         rcu_read_lock();
 295         sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
 296         if (!sta) {
 297                 wl1271_error("could not find sta %pM for starting ps",
 298                              wl->links[hlid].addr);
 299                 rcu_read_unlock();
 300                 return;
 301         }
 302
 303         ieee80211_sta_ps_transition_ni(sta, true);
 304         rcu_read_unlock();
 305
 306         /* do we want to filter all frames from this link's queues? */
 307         if (clean_queues)
 308                 wl1271_ps_filter_frames(wl, hlid);
 309
 310         __set_bit(hlid, &wl->ap_ps_map);
 311 }
 312
 313 void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid)
 314 {
 315         struct ieee80211_sta *sta;
 316         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 317
 318         if (!test_bit(hlid, &wl->ap_ps_map))
 319                 return;
 320
 321         wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
 322
 323         __clear_bit(hlid, &wl->ap_ps_map);
 324
 325         rcu_read_lock();
 326         sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
 327         if (!sta) {
 328                 wl1271_error("could not find sta %pM for ending ps",
 329                              wl->links[hlid].addr);
 330                 goto end;
 331         }
 332
 333         ieee80211_sta_ps_transition_ni(sta, false);
 334 end:
 335         rcu_read_unlock();
 336 }